Node.js is a platform built on V8 (Google's open source JavaScript engine). Node.js allows us to run JavaScript outside a web browser. We can write backend and desktop applications using TypeScript and Node.js.
Even if we are planning to write backend applications, we are going to need Node.js because many of the tools used in this chapter are Node.js applications.
If you didn't install Node.js in the previous chapters, you could visit https://nodejs.org/en/download/ to download the installer for your operating system.
